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Date: Fri, 27 Apr 2012 03:52:01 +0000 (UTC)
From: "Ashish Singhi (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
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Subject: [jira] [Commented] (HDFS-3286) When the threshold value for
 balancer is 0(zero) ,unexpected output is displayed
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    [ https://issues.apache.org/jira/browse/HDFS-3286?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13263330#comment-13263330 ] 

Ashish Singhi commented on HDFS-3286:
-------------------------------------

{code}
-1 core tests. The patch failed these unit tests:
org.apache.hadoop.fs.TestUrlStreamHandler
{code}
Not related to this fix.
                
> When the threshold value for balancer is 0(zero) ,unexpected output is displayed
> --------------------------------------------------------------------------------
>
>                 Key: HDFS-3286
>                 URL: https://issues.apache.org/jira/browse/HDFS-3286
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: balancer
>    Affects Versions: 0.23.0
>            Reporter: J.Andreina
>            Assignee: Ashish Singhi
>             Fix For: 0.24.0
>
>         Attachments: HDFS-3286.patch, HDFS-3286.patch
>
>
> Replication factor =1
> Step 1: Start NN,DN1.write 4 GB of data
> Step 2: Start DN2
> Step 3: issue the balancer command(./hdfs balancer -threshold 0)
> The threshold parameter is a fraction in the range of (0%, 100%) with a default value of 10%
> When the above scenario is executed the Source DN and Target DN is choosen and the number of bytes to be moved from source to target DN is also calculated .
> Then the balancer is exiting with the following message "No block can be moved. Exiting..." which is not expected.
> {noformat}
> HOST-xx-xx-xx-xx:/home/Andreina/APril10/install/hadoop/namenode/bin # ./hdfs balancer -threshold 0
> 12/04/16 16:22:07 INFO balancer.Balancer: Using a threshold of 0.0
> 12/04/16 16:22:07 INFO balancer.Balancer: namenodes = [hdfs://HOST-xx-xx-xx-xx:9000]
> 12/04/16 16:22:07 INFO balancer.Balancer: p         = Balancer.Parameters[BalancingPolicy.Node, threshold=0.0]
> Time Stamp               Iteration#  Bytes Already Moved  Bytes Left To Move  Bytes Being Moved
> 12/04/16 16:22:10 INFO net.NetworkTopology: Adding a new node: /default-rack/yy.yy.yy.yy:50176
> 12/04/16 16:22:10 INFO net.NetworkTopology: Adding a new node: /default-rack/xx.xx.xx.xx:50010
> 12/04/16 16:22:10 INFO balancer.Balancer: 1 over-utilized: [Source[xx.xx.xx.xx:50010, utilization=7.212458091389678]]
> 12/04/16 16:22:10 INFO balancer.Balancer: 1 underutilized: [BalancerDatanode[yy.yy.yy.yy:50176, utilization=4.650670324367203E-5]]
> 12/04/16 16:22:10 INFO balancer.Balancer: Need to move 1.77 GB to make the cluster balanced.
> No block can be moved. Exiting...
> Balancing took 5.142 seconds
> {noformat}

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